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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Increase (decrease) in valuation allowance |  |  | $ (49,600,000)
Accounts Receivable Reserves |  |  |
Balance at beginning of period | $ 1,109 | $ 1,630 | 1,066
Charged to cost and expenses | 1,244 | 2,173 | 1,604
Write-offs, Exchange Rate Fluctuations and Other Items | (1,110) | (2,694) | (1,040)
Balance at end of period | 1,243 | 1,109 | 1,630
Valuation Allowance Of Deferred Tax Assets [Member] |  |  |
Balance at beginning of period | 11,986 | 11,125 | 59,391
Net additions charged to income (expense) | (1,922) | 874 | (47,659)
Write-offs, Exchange Rate Fluctuations and Other Items | (1,102) | (13) | (607)
Balance at end of period | $ 8,962 | $ 11,986 | $ 11,125

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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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